Crossword Genius

Jar for this berry? (4)

Ross

I believe the answer is:

rasp

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'jar' is the definition.
(make unpleasant sound)

I cannot understand how the rest of the clue works.

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(Other definitions for rasp that I've seen before include "Make a grating noise" , "sort of berry?" , "Harsh grating sound" , "Smoother" , "Filing tool" .)

I've seen this clue in The Telegraph.
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